@article{MT_2009_12_1_a1,
     author = {A. V. Kravchenko},
     title = {Complexity of quasivariety lattices for varieties of differential groupoids},
     journal = {Matemati\v{c}eskie trudy},
     pages = {26--39},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_2009_12_1_a1/}
}